There's nothing worse than getting caught in a downpour. You leave the house in the morning and everything is sunshine and flowers, only to leave your office to discover yourself in a watery hell. It's called planning ahead, dude. You should try it.
If you had the Thunderbolt Pro, you'd be warned in plenty of time to get an umbrella and get yourself prepped for the onslaught. It detects storm activity up to 75 miles away and lets you know when to expect nasty weather. I mean, sure, you could watch the news or check the weather online, but neither of those options give you an excuse to waste $430 on a fancy new gadget, do they?